Originally Posted by Douglas.Curtis
50 is minimum for full on indicas. 65 is about max without additional co2. You'll find general agreement around those figures.
What he said, 100 watts per sq ft, is way to much even with co2. Stick with 50 watts per sq ft.
Most of these grow box's are a rip off. Many people here could help you do way better. I did a 4x4x8 box with 2x 600w vert with 2 levels 16 plants, 2 pounds of prime Buddha. Lights, blower and, filter nothing to expensive mabey 500 bucks max. A little growbox might get you a few ounces.